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    <center>Scilab Function</center>
    <div align="right">Last update : April 1993</div>
    <p>
      <b>parrot</b> -  Parrot's problem</p>
    <h3>
      <font color="blue">Calling Sequence</font>
    </h3>
    <dl>
      <dd>
        <tt>K=parrot(D,r)  </tt>
      </dd>
    </dl>
    <h3>
      <font color="blue">Parameters</font>
    </h3>
    <ul>
      <li>
        <tt>
          <b>D,K</b>
        </tt>: matrices</li>
      <li>
        <tt>
          <b>r</b>
        </tt>: 1X2 vector (dimension of the 2,2 part of <tt>
          <b>D</b>
        </tt>)</li>
    </ul>
    <h3>
      <font color="blue">Description</font>
    </h3>
    <p>
    Given a matrix <tt>
        <b>D</b>
      </tt> partionned as <tt>
        <b>[D11 D12; D21 D22]</b>
      </tt>
    where <tt>
        <b>size(D22)=r=[r1,r2]</b>
      </tt>
    compute a matrix <tt>
        <b>K</b>
      </tt> such that
    largest singular value of <tt>
        <b>[D11 D12; D21 D22+K]</b>
      </tt>
    is minimal (Parrot's problem)</p>
    <h3>
      <font color="blue">See Also</font>
    </h3>
    <p>
      <a href="h_inf_st.htm">
        <tt>
          <b>h_inf_st</b>
        </tt>
      </a>,&nbsp;&nbsp;</p>
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